An optical element includes a substrate, and a multilayer film provided on the substrate. The multilayer film has an average transmittance of 75% or higher for light having a wavelength of 470 nm to 630 nm incident at an incident angle of 0° and a transmittance of 10% or lower for light having a wavelength of 1550 nm incident at an incident angle of 0°. The multilayer film includes a layer made of a first material and a layer made of a second material alternately layered, and a final layer made of a third material disposed on an outermost side, and a predetermined condition is satisfied.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The optical element according to claim 1, wherein the average transmittance of the multilayer film for light having a wavelength of 420 nm to 680 nm incident at the incident angle of 0° is 80% or higher.
3. The optical element according to claim 1, wherein a difference between a maximum reflectance and a minimum reflectance of the multilayer film at a wavelength of 470 nm to 630 nm is within 8%.
4. The optical element according to claim 1, wherein the multilayer film has a band where the transmittance is 10% or lower at a wavelength of 700 nm to 1000 nm.
5. The optical element according to claim 1, wherein the multilayer film has 14 to 81 layers inclusive.
7. The optical element according to claim 1, wherein the transmittance of the multilayer film at the wavelength of 1550 nm is 5% or lower.
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June 4, 2020
August 30, 2022
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